I'm assuming that you plan on using your reciever for both DVD and for playing games, in which case you wouldn't have any speakers directly connected to your soundcard, but rather the speakers would be connected to your reciever. Then you would use 1/8" stereo to RCA connectors to connect your soundcards front/rear 1/8" analog outputs (assuming the soundcard you use has front/rear outputs for 4 speaker support in games) into your recievers RCA 5.1 analog inputs and you would also connect the SPDIF to the reciever for DVDs. Then when your playing games you would switch your reciever to the analog 5.1 input mode, and while watching DVDs you would switch it to the SPDIF input mode.